Cross-arm.



L. LJGRABTREEKL T C. RIPLBY.

(moss ARM.

APPLICATION FILED FEB. 17, 1912.

1,047,176. Patented Dec. 17, 1912.

' 2 S H EETSS HEET 1.

COLUMBIA-PLANOGRAPH c0. WASHINGTON. n, c.

L. L. ORABTREE & T G. RIPLEY.

GROSS ARM.

APPLICATION FILED PEB.17, 1912.

Patented Deb. 17,1912.

2 SHEETS-SHEET 2.

ammm I.L.CTI1 Bm'ee COLUMBIA PLANOORAPH 10.. WASHXNGTON, D. c.

UNITED STATES PATENT OFFICE.

LAWRENCE L. CRABTREE AND T CHARLEY RIPLEY, OF SULPHUR SPRINGS, TEXAS.

oRoss-Amvr.

To all whom it may concern:

Be it known that we, LAWRENCE L. CRAB- TREE and T CHARLEY RIPLEY, citizens of the United States, residing at Sulphur Springs, in the county of Hopkins and State of Texas, have invented certain new and useful Improvements in Cross-Arms, of which the following is a specification.

This invention relates to improvements in cross arms for telegraph and telephone poles.

The principal object of this invention is to provide a cross arm and a pair of extension arms detachably connected to the ends thereof.

Another object of the invention is to provide a cross arm of such construction as to permit the same to be readily attached to or detached from a pole.

A further object of the invention is to provide a cross arm of the character described which is composed of a relatively few number of parts, is therefore simple in construction, and is cheap to manufacture.

With these and other objects in view, the invention consists in the construction and novel combination of parts hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended; it being understood that various changes in the form, proportion, size and minor details of construction within the scope of the claims, may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawings: Figure 1 is a detail front elevation showing the application of our invention, Fig. 2 is a top plan view thereof, Fig. 3 is a detail sectional View taken on the line 33 of Fig. 1, Fig. 4 is a longitudinal sectional view taken on the line 44 of Fig. 2, Fig. 5 is a plan view of the blank from which the main cross arm is constructed, and Fig. 6 is a plan view of the blank from which one of the extension arms is constructed.

Like reference numerals designate corresponding parts in all the figures of the drawings.

Referring to the drawings, there is shown a telegraph pole 5 of any suitable construction having a recess 6 formed therein for receiving my improved cross arm. This cross arm comprises a main arm A and ex- Specifieation of Letters Patent.

Application filed February 17, 1912.

Patented Dec. 17, 1912.

Serial No. 678,167.

tension arms BB, all of said arms being formed from sheet metal.

The main arm A is formed from a blank of sheet metal, as shown in Fig. 5 of the drawings. This blank is folded longitudinally upon the dotted lines 77 to form a resultant top 8, a rear wall 9 and a depending longitudinal lip 10. The rear wall 9 is centrally formed with a depending lip or enlarged portion 12, and formed in this lip is an opening 13 through which an attaching bolt 14 is adapted to be inserted, said bolt being disposed within a suitable opening formed in the pole 5. Centrally formed in the longitudinal lip 10 and registering with the depending lip 12 is a cut-away portion 15 for facilitating the attachment or removal of the nut 16 upon the bolt 14. Formed in the top 8 and at either end thereof, is a plurality of spaced openings 17, and projecting downwardly into each of said openings is a threaded end of an insulating pin 18, each pin being formed with an integral collar 19 for limiting the downward movement thereof. Nuts 20 are disposed below the top 8, and are respectively connected to the threaded ends of said pin for fixedly securing the same to the arm. Insulators 21 of any suitable type are mounted upon the upper ends of said pins. Braces 22-22 are each connected to the rear wall 9 on opposite sides of the center thereof by means of bolts 23 or other suitable fastening means. The free ends of these braces are brought together in overlapping relation, and are secured to the pole 5 by means of a bolt 24. Each extension arm B is likewise formed from a blank of sheet metal which is bent longitudinally upon the dotted lines 2525 to form a resultant top 26, a rear wall 27 and a depending longitudinal lip 28. These extension arms B are each of such a size as to be readily disposed within a respective end of the main arm A. The top 26 is formed with a plurality of spaced outer openings 29-29 and an inner opening 30, the latter registering with the respective outer opening of the arm A for receiving the outer insulating pin of said arm. It will thus be observed that the outer insulating pins serveto connect the extension arms B to the main arm A. Insulating pins similar in construction to those carried by the main arm A are associated with the openings 30 of the extension arms B. In order to more tageous especially where the longer arm is' necessary in order to accommodate additional wires.

l/Vhat is claimed is:

1. A cross arm formed from a blank of sheet metal bent longitudinally to form a top, rear wall and a downwardly extending front lip, the wall being centrally formed with a downwardly projecting attaching lip and the front lip being cut away at a point 20 in register with the attaching lip.

2. A cross arm comprising in combina tion, a main arm forming in cross section a U-shaped structure, a correspondingly shaped extension arm interfitted with one 25 end of the main arm, one of the sides of the main arm and the corresponding side of the extension arm depending below the other sides of the main and extension arms, and

fastening means for the arms extending 30 through the depending portions thereof.

In testimony whereof we affix our signa tures, in the presence of two witnesses.

LAlVRENCE L. CRABTREE. T CHARLEY RIPLEY. WVitnesses D. E. MAGRILL, W. A. SMlTI-I.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G. 

